Speaking as someone with dual nationality and having spent decades living in both countries, I don't think there is much difference between patterns of consumption of dairy products in Australia vs UK.Australia (and small NZ) are probably much more of a 'dairy' culture (no pun intended) than the UK, but France and some other nations with their EU-subsidised dairyfarmers are oddly more akin to Oz and NZ than UK in that regard. Perhaps the notorious English climate (which I enjoy when in your nation) is to blame, as yoghurt may be considered unsuitable for a wet/cloudy/cold day's start?
A quick look at per capita milk consumption data confirms this is the case.
Perhaps you were unlucky in the shops you visited, as there is a lot of yoghurt consumed in the UK. The only difference I have noticed is that there does seem to be something a preference for multi-packs of small pots (i.e., assorted flavours) in the UK compared to larger tubs in Australia (albeit it is 6 years since my last visit and things might have changed....)